Protecting arrangement for cutters and other rotary apparatus.



P. G. C. LUNDBBRG. PNOTEGTING @RANGEMENT EOE GUTTERS AND OTHER ROTARY APPABATUB.

APPLICATION FILED 00T. 21,v 1907. 901,458.

Patented, oct. 2o, 1908. Tl Q PEE GEORG CARL LUNDBERG, OF WRNAMO, SWEDEN.

PROTECTING ARRANGEMENT FOR CUT'TERS AND OTHER ROTARY APPARATUS.

Specification of Letters Patent;

Patented oct. 2o, 1908. A

Application led ctober 21, 1907. Serial No. 398,519.

To all whom it may concern:

Be it known thatI, PER GEORG CARL LUND- BERG, a subject of the King of Sweden, factory owner, and residing at VVrnamo, in the Kingdom of Sweden, have invented new and useful Improvements' in Protecting Arrangements foi` Cutters and other Rotary Apparatus, of whichly the following is a specification.

This irivntiqljl relates to improvements in guards for i'otfai'yscutters such as are used in wood turning shopsiand the invention has to do with that :form of guard which automatically covers the cutting tool when the same is not operating and which is automatically withdrawn from a covering or closing position by the work as the same is advanced to the cutter.

One object of the present invention is to avoid the usual mechanism above the work table for operating the guard and to provide a guard which in itself 1s disposed below the work table either when in an Aopening or closing position.

The invention will be more fully described in connection with the accompanying drawings a-nd will be more particularly pointed outy and ascertained in and by the appended claims.

' In the drawing Figure l, is a longitudinal sectional view of a wood cutting mechanism showing the application thereto of my improved Ouard, the. latter being in an open position. 4ig. 2, is a similar view showing the guard in a closed position. Fig. 3 is a l1an view with the guard in a closed position.

Like characters of reference designate similar parts throughout the different figures of the drawing.

As shown the device of my invention is applied to a wood turning apparatus which consists of a work table 0 provided with an opening p through which arotary .cuttingvtool c projects 1n a manner to operate upon the work aas illustrated in Fig. 1. It will be understood however that I do not wish to be limited to this specific application of my invention as the -same is serviceable in connection with many other forms of apparatus. lc designates a guard which as shown is circular and is slidably mounted guides 1 Said guard k is disposed in a manner to be operated from beneath the work table and com letely close or open the opening p/and at a'l times lies below the work table. As shown a projection k2 is formed ontheJ guard lc to which rejection is pivotally connected a socket z'. shaft cl is conveniently mounted in hanger o depending from the table 0 and is provided with or carries a hub (Z2 ou which arms d, e and f are formed. A weight a is mounted on the arm or extension j' and serves to normally maintain the parts in the position shown in Fig. 2. The arm (l projects through an opening b formed -in the table o which opening b is disposed somewhat in advance of the opening p so that the arm a7 will be engaged by the work a as the latter is advanced toward the cutter c. The

armprojects into` and slidably engages the socket z' so that when the weighted extension f' or the arm d rotates the shaft d the arm e and socket z' will move the guard 7c into or out of the closing position in accordance with the direction of movement imparted to said shaft d.

As shown in Fig. 3, a plurality of guards /c is provided and each guard is automatically operated by a device similar to that described in Figs. 1 and 2 for the guard thereof. It will be obvious in this'arrange- -ment that if a narrow piece of wood is to be operated upon it may be advanced in aline- 'ment with one of the arms d so as to engage the same and move one of the guards 7c into an opening position thereby permitting the remaining guards to remain in a closing position so as to prevent injury Which might otherwise result from exposing portions ofv the cutter c extending laterally on either side of the work. If a relatively wide piece of wood is to be operated upon a correspondi'ngly greater number of guards k will be thrown into an opening position.

Referring to Fig. 2, it will be obvious that. as the work is advanced on the table toward the cutter c it would first engage the arm cl .and swing the guard 7c into an opening position to expose the cutter c and swingthe weighted extension into t-he position shown in Fig. l.. When the end of the work a has been advanced forwardly beyond the arm d i the latter will be released and as soon as the work a has passedv beyond the opening p the weighted extension will swing the guard 7c 'finto a closing position as shown in Fig. 2.

I olaimc-v f l. A device of the class described comprising in combination, a work table proylded with an opening for a cutting tool and a slot located in, advance of said opening, a rotary-*cutting tool projecting through said opening to engage the'work on said table, a circular shield for closing said opening, circular guides for said shield, a socket pivotally mounted on said shield, a shaft mounted beneath-said table adjacent lsaid slot, a hub mounted on said shaft and provided with a work actuated arm adapted to project through said slot into the path of said Work, said hub having a shield lever longitudinally movable in said socket, and a. weighted extension serving to normally throw said shield into a closing position and move said arm into the path of said work.

2. A device of the class described comprising in combination, a work table puovided with an opening for a cutting tool and 'a slot located in advance of said opening, a

4rotary cutting tool projecting through said opening` to engage the work on said table, a

ircular shield'for closing said opening, cir- 'i'. cular guides for said shield, a socket pivot- 'f ally mounted on said shield, a shaft mount ed beneath said table adjacent said slot, a hub mounted on said shaft and provided with a work actuated arm adapted to pro,- ject through said slot into the path of the Work, said hub having a shield lever longitudinally movable in said socket, and means acting through said hub and serving to noi mally close said shield and throw said arm into said slot.

3. A device of the class described comprising in combination, a work table provided with an opening for a cutting tool and a l slot located in advance of said opening, a movable cutting tool projeeting through said opening to engage the work onsaid tableI a shield for completely closing said 4i. A device of the class described compris" ing in combination, a work table provided with an opening for a cutting tool, a movable cutting tool projecting through said opening to engage the work on said table, a shield for completely closing said opening, means actuated by the work for moving said shield into a position wholly below said table to open said opening, and means serving to normally throw said shield into a position to completely close said opening.

5. A device of the class described comprising in combination, a work table provided with an opening, a movable cutting tool projecting through said opening to engage the vwork on said table, a shield for completely closing said opening, automatic means serving to normally throw said shield into a position to completely close said opening, and means actuated by the work for throwing said shield into an open positionwholly below said table.

In testimony whereof I afX my signature in presence oi two witnesses.

PER GEORG CARL LUNDBERG.

litnesses E. HEDENSKOG; I. LARsoN. 

